In the works! You should be able to use the existing <youtube-video-element> [1] with the HTML side of v10 today, but we're working on porting over the other media elements into the new architecture for better React support.
Plyr did a good job of removing the branding via some clever css, but its annoying you cannot access settings and cc. One idea for a cc button is to always have cc on and then toggle the height styling to show/hide it